论文部分内容阅读
1.选好制种田。一般把制种田安排在地势平坦、土壤肥沃、地力均匀、排灌方便的地块上。这是保证制种田玉米出苗整齐、花期一致、高产优质的基础。 2.采用“宽窄行二比点”种植方式。大行距为75厘米,小行距为45厘米,种两行母本,株距20厘米,大行中间套种一行父本,株距60厘米。这样既增加了母本密度,又使父本分布均匀。 3.适时间苗。亲本长出5～6片叶时,根据叶色、叶鞘色、生长势进行间苗,并去掉杂株,疏去疙瘩苗。随着植株的生长,结合中耕,再根据株型、长势、叶片形状和花丝颜色等特征,随时去杂去劣,以保证亲本性状。 4.九叶期追穗肥。当母本第九片叶展开时,其雄穗正处于幼穗分化到小花期,雌穗进入生长
1. Selected system of farming. The general system of farming arranged in the flat, fertile soil, fertility, irrigation and drainage convenience of land. This is to ensure the system of corn seedling neat, consistent flowering, high yield and quality foundation. 2. Adopt “width line two point ” planting method. Large row spacing of 75 cm, small row spacing of 45 cm, two rows of female parent, plant spacing of 20 cm, large firms in the middle of a line of paternity, spacing 60 cm. This will not only increase the density of the female parent, but also to distribute the male parent evenly. 3. Time seedlings. The parents grow 5 to 6 leaves, according to leaf color, leaf sheath color, growth potential for Miao Miao, and remove miscellaneous strains, sparse to pimple seedlings. With the growth of plants, combined with cultivation, and then according to plant type, growth, leaf shape and color characteristics of silk, go to miscellaneous and evil at any time to ensure the parental traits. Jiuye period panicle. When the ninth leaf of the female parent unfolds, its tassel is in the stage of young spike differentiation to flowering, and the ear of ear enters into growth